I've seen it after upgrading an application, or if you have multiple versions of Fox going to the same Resource file.
How to get rid of it? well, the next time is asks, you say 'Yes'. Or, you could Set Resource Off
>Hello All,
>
>Getting Invalid Resource File - Replace with new and empty one? dialogue. Why is this so and how do I get rid of if?
>
>Thanks in advanced.
>
>R. Lee
"You don't manage people. You manage things - people you lead" Adm. Grace Hopper
Pflugerville, between a Rock and a Weird Place